Glass-to-crystal transition in the NASICON glass-ceramic system Na1+xAlxM2−x(PO4)3 (M=Ge, Ti) - Bradtmüller, Henrik; Nieto-Muñoz, Adriana M.; Ortiz-Mosquera, Jairo F.; Rodrigues, Ana C. M.; Eckert, Hellmut (Journal of Non-Crystalline Solids, 2018)